Update of /cvsroot/alsa/alsa-lib/src/pcm
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv11463
Modified Files:
pcm.c
Log Message:
Next documentation update for file descriptor routines
Index: pcm.c
===================================================================
RCS file: /cvsroot/alsa/alsa-lib/src/pcm/pcm.c,v
retrieving revision 1.281
retrieving revision 1.282
diff -u -r1.281 -r1.282
--- pcm.c 31 Mar 2004 14:16:31 -0000 1.281
+++ pcm.c 5 Apr 2004 17:59:34 -0000 1.282
@@ -1226,7 +1226,12 @@
* call, use \link ::snd_pcm_poll_descriptors_revents() \endlink function.
* The field values in pollfd structs may be bogus regarding the stream
* direction from the application perspective (POLLIN might not imply read
- * direction and POLLOUT might not imply write).
+ * direction and POLLOUT might not imply write), but
+ * the \link ::snd_pcm_poll_descriptors_revents() \endlink function
+ * does the right "demangling".
+ *
+ * You can use output from this function as arguments for the select()
+ * syscall, too.
*/
int snd_pcm_poll_descriptors(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int space)
{
@@ -1258,6 +1263,11 @@
*
* This function does "demangling" of the revents mask returned from
* the poll() syscall to correct semantics (POLLIN = read, POLLOUT = write).
+ *
+ * Note: The null event also exists. Even if poll() or select()
+ * syscall returned that some events are waiting, this function might
+ * return empty set of events. In this case, application should
+ * do next event waiting using poll() or select().
*/
int snd_pcm_poll_descriptors_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned
int nfds, unsigned short *revents)
{
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